ASP固定比例裁剪缩略图的方法

Function MakePic(sourcpic,newwidth,newheight,destpic) 
On error resume next 
MakePic=false 
Set Jpeg = Server.CreateObject(“Persits.Jpeg”) 
if Err then 
response.Write (“错误空间没安装aspjpeg组件”) 
response.end 
end if 
Jpeg.Quality = 100 
Jpeg.Open sourcpic 
jpeg.PreserveAspectRatio = True ‘等比缩放 
if jpeg.OriginalWidth/jpeg.OriginalHeight > newwidth/newheight then'太扁了，要剪掉左右部分 
jpeg.Height = newheight 
jpeg.crop CInt((jpeg.Width – newwidth)/2),0,CInt((jpeg.Width – newwidth)/2)+newwidth,newheight 
else ‘太高了，要剪掉上下部分 
jpeg.Width = newwidth 
jpeg.crop 0,CInt((jpeg.Height – newheight)/2),newwidth,CInt((jpeg.Height – newheight)/2)+newheight 
end if 
Jpeg.Save destpic 
if err.number=0 then MakePic=True 
Jpeg.Close 
Set Jpeg=Nothing 
End function